pci slots

I have 6 pci slots on my mobo(Abit kt7A),only 2 are being used.No1-Modem,No2-sound card,can I move either to another slot to give a bit of space(heat?),what are the pitfalls if any?and what is the procedure?
Cheers

Should'nt have any real problems...unless the sharing of some IRQ's conflict..but using PCI slots 1 and 3 should work for ya....even though I don't think a heat problem is any results of a Modem and Sound Card